It's a problem. I think the solution is to show two ratings: Overall and recently. The recent rating shouldn't depend on the last update but a fixed time frame

It's a problem. I think the solution is to show two ratings: Overall and recently. The recent rating shouldn't depend on the last update but a fixed time frame like 2-3 months. Steam does it that way and it makes sense. Quality of software changes, some of the apps have seen several major updates and redesigns - an overall rating is slow to account for those. A per-version-rating jeopardizes established good ratings for minor updates.